Liquid and gas sealing cardboard package

ABSTRACT

A package which is both liquid and gas sealing comprising an outer package of relatively stiff material such as cardboard, an inner package of thin sealing material and a sealing lid which sealingly receives the upper edges of both the outer and inner packages. Both the inner and outer packages are formed from a continuous blank including bottom, side and corner pieces. The corner pieces are formed by a corner panel and a fold part on each side of the corner panel resting against the inside of the adjacent side piece. The fold part of the outer package is received within the corresponding fold of the inner package and at least each fold part of the outer package is of less height than its side pieces and corresponding corner and side pieces of the inner package so that the upper part of the outer package along its whole upper edge is formed by only one layer of cardboard.

United States Patent [1 1 Christensson LIQUID AND GAS SEALING CARDBOARD PACKAGE [75] Inventor: 0d Wikar Christensson, Bromma,

Sweden [73] Assignee: Christenssons Maskiner & Patenter AB, Bromma, Sweden [22] Filed: June 12, 1972 [21] Appl. No.: 261,957

[30] Foreign Application Priority Data June 30, 1971 Sweden 8424/71 [52] US. Cl. 229/14 BA, 220/63 R, 229/31 R [51] Int. Cl B65d 5/58 [58] Field of Search 229/14 BA, 14 BE, 14 C,

229/14 H, 16 C, 31 R; 220/63 [56] References Cited UNITED STATES PATENTS 1,673,535 6/1928 Sheehy 229/6 R 1,704,175 3/1929 Coale 229/14 BA 2,377,989 6/1945 Braun 150/.5 2,568,170 9/1951 Ringler 229/14 BA 3,302,825 2/1967 Schleeweiss 220/67 3,489,331 1/1970 Andersson 229/14 [451 Feb. 4, 1975 FOREIGN PATENTS OR APPLICATIONS 379,378 8/1964 Switzerland 229/14 BA Primary Examiner-William T. Dixson, Jr. Assistant ExaminerBruce I-I. Bernstein Attorney, Agent, or Firm--Larson, Taylor and Hinds [57] ABSTRACT A package which is both liquid and gas sealing comprising an outer package of relatively stiff material such as cardboard, an inner package of thin sealing material and a sealing lid which sealingly receives the upper edges of both the outer and inner packages. Both the inner and outer packages are formed from a continuous blank including bottom, side and corner pieces. The corner pieces are formed by a corner panel and a fold part on each side of the corner panel resting against the inside of the adjacent side piece. The fold part of the outer package is received within the corresponding fold of the inner package and at least each fold part of the outer package is of less height than its side pieces and corresponding corner and side pieces of the inner package so that the upper part of the outer package along its whole upper edge is formed by only one layer of cardboard.

4 Claims, 5 Drawing Figures 1 LIQUID AND GAS SEALING CARDBOARD PACKAGE The present invention relates to a liquid and gas sealing package comprising an outer package of cardboard or any other fairly stiff material and an inner package of a thin and easily formable sealingly material which completely covers the interior of the outer package, and a sealing lid which sealingly encloses the upper edge of both the outer package and the inner package in a downwards open groove.

The new package is intended to be used for all kinds of goods in solid, liquid or powder form which are expected to be packed hermetically. However, for the sake of simplicity substantially only a package will be described which is in particular intended for roasted and ground coffee. It must not however be considered a limitation of the invention.

The invention was prompted by the problem of providing a package which is both liquid sealing and gas sealing and which may be manufactured rapidly and by simple means, which is cheap to manufacture and which may easily be destroyed or compressed to small volume after the content of the package has been consumed.

This problem is solved by a package of the kind mentioned where both the outer package and the inner package are each formed of a continuous package blank comprising bottom, side pieces and corner pieces, whereby the corner pieces are formed by a corner panel and a fold part at each side of the said corner panel which rests against the inner side of the adjacent side piece, and whereby the fold part of the outer package is enclosed within the corresponding fold of the inner package.

In order obtain a completly tight package it is extremely important that a good seal is obtained between the lid and the inner package, and in this connection it is of importance that the upper edge of the package, against which the lid shall seal forms an edge, be of as even a thickness as possible, so that no creep leakages can arise. In order to avoid differences in thickness at the upper edge of the package the fold of the outer package resting against the inside of the adjacent side piece is in one embodiment of the invention formed so much lower than the side pieces and the corner panels, that the upper edge of the outer package is formed of one single layer of card-board material along the whole of the package. The inner package is formed of such a thin material that the corresponding folds thereof, which are of the same height as the side pieces and the corner panels of the outer package, provide a completely negligible increase of the thickness of the package along the upper edge, so that an extremely good tightness may be obtained between the lid and the outer and inner package without any risk of creep leakages.

In another embodiment ofthe invention both the fold parts of the outer package and the corner panels are formed with a reduced height as mentioned above, and in this embodiment a particularly good seal will be obtained in the corners of the package, even if the lid has round corners, while the corners of the outer package are formed by three plane surfaces contacting each other at blunt angles.

The present invention also refers to a method of manufacturing a package of the kind mentioned above.

Further characteristics and particulars of the invention will be evident from the following detailed description and the appended claims. The following detailed description will refer to the accompanying drawings, of which FIG. 1 is a perspective view of a package according to the invention having an opened lid partly broken away.

FIG. 2 shows more in particular and on an enlarged scale one corner of the package during the manufacture of the package, and

FIG. 3a and 3b represent two different embodiments showing in the upper part each a prepared blank for the outer package and inner package seen from underneath, partly in a fragmentary view.

FIG. 4, finally, is a perspective view similar to FIG. 1 ofa modified embodiment of the invention, the blank of which is shown in the lower part of FIGS. 3a and 3b.

The package according to the invention generally comprises a outer package 1, an inner package 2 and a lid 3. Both the outer package 1 and the inner package 2 form, at ready prepared package, a closed, tight cup, and the inner package is adapted to cover the complete interior of the outer package 1. The packages shown in the embodiment are octagonal, but it is obvious that the invention includes packages of any polygonal or other bottom section.

As best shown in FIGS. 3a and 3b the outer package I is formed in one continuous piece and includes a bottom 4 with eight edges, four side pieces 5, four corner panels 6 and corner fold pieces 7 and 8 on each side of said corner panels connecting the side pieces 5 and the corner panels 6. The side pieces 5 are connected to the bottom of the package over creasing lines 10 and with the side pieces over creasing lines 11. The corner fold pieces 7 and 8 are somewhat cut down from the imaginary line connecting the outer edges of the side pieces 5 with the outer edges of the corner panels 6, which lines correspond to the upper edge of the package at ready prepared package. The aim of this cutting down will be evident from the following. The corner fold pieces 7 and 8 have a central creasing line 12 extending from the corner where the creasing lines 9, l0 and 11 get together. In the drawings the corner panels 6 have for the sake of clearness been indicated with dot and dash lines, but it should be noted, that the corner panel 6 in fact forms a continuous part together with the two adjacent halfs of the corner fold parts 7 and 8. As likewise bestevident from FIGS. 3a and 3b in particular the upper left part, where a part of the outer package 1 broken away exposes the inner package 2 the inner package is also formed with bottom, side pieces 14 and corner pieces 15, and various part of the inner package are coherent with each other over creasing lines l6, l7 and 18 respectively.

For the corner folding of the inner package this is in addition to the creasing line 18 formed with a further creasing line 19 extending from the corner, where the creasing lines l6, l7 and 18 get together. It is to be observed, that the creasing lines 19 of two adjacent corner pieces 15 form a less angle with each other than the corresponding creasing lines 12 of the outer package and that the creasing lines 18 of one and the same side piece 14 converge somewhat in the direction from the bottom piece, while, on the contrary, the corresponding creasing lines 11 of the outer package 1 diverge somewhat. The purpose thereof is to avoid any tension or traction in the inner package due to actuation from the outer package when the corner folding takes place, and as best evident from FIG. 2 the corner fold lines of the inner package are somewhat spaced from the corresponding corner lines of the outer package. This contributes to eliminate the risk of creep leakages in the ready prepared package.

As evident in particular from FIGS. 30 and 3b the inner package 2 is of the same size as the outer package 1 except that the inner package does not correspond to the cuttings in the outer package between the corner panels 6 and the side pieces 5. Consequently the inner package will form an outwardly extending extension at I 20 compared with the outer package, and the said extension 20 will form the seal against the lid 3.

ln the embodiment shown in the lower part of FIG. 3b, both the corner fold pieces 8 of the outer package and the corner panels 6 are cut down, and in this embodiment only the part of the corner piece of the inner package corresponding to the corner panel 6 of the outer package will form the seal between the package and the lid.

The lid is formed in the conventional manner with a groove 21 open at the bottom and having such width and depth that it may be pushed down over the upper edge of the combiantion of outer package and inner package, and the lid is sealingly attached to the package cup in conventional way, for instance by means of wax or the like. As mentioned above the outer package is made of card-board or any similar stiff material while the inner package is made of a thin tight material for instance an aluminum foil which is covered by a layer of plastic on the inside of the package to be manufactured. The lid may be made of any suitable synthetic resin and it is preferably formed with some kind of strip means for facilitating the opening of the package.

The manufacture of the package is carried through so that the outer package 1 and the inner package 2 separately from each other are punched out and creased, whereupon the inner package is attached in exact coinciding position over the outer package for instance by mean of gluing the bottoms of the package parts together. In this fixed position the package is erected by raising the creasing lines 12 and 19, whereupon the sides 5 are erected, so that the corner pieces 7 and 8 of the package and the corresponding parts of the inner package are turned against the adjacent side piece. Thanks to the cuttings of the corner pieces 7 and 8 the side edges of the upper free part of the corner panels 6 will flush with the corresponding side edges of the side pieces 5, so that the outer package along its whole upper edge is formed only by one layer of card-board. In the embodiment of the invention shown in FIG. 4 the corner of the package will be formed only by the inner package, while the intermediate parts of the package will be formed by the inner package and one layer of card-board, and consequently in neither of the two cases the upper edge of the package will be formed by more than one layer of card-board. The extended part of the inner package will however with more layers rest against the side pieces 5 of the outer package, but since the inner package is made ofa very thin material this is no disadvantage with respect to the tightness of the package. With the package erected to cup form in the above described manner the lid 3 is pushed down over the upper edge ofthe package, so that the said upper edge will be received in the groove of the lid which is open downwards. As mentioned above the tightening between the lid 3 and the upper edge of the package is established by means of wax or any other suitable material which is applied either to the upper edge of the package cup or to the downwards directed groove of the lid before the application of the lid on the package. For making it possible to re-close the package this may be provided with a further, re-closable lid which is applied on top of the lid 3.

The above described package and method are only illustrating examples of the invention which are not limiting same, and it is obvious that all kinds of modifications may be presented within the scope of the appended claims.

I claim:

I. A liquid and gas sealing package comprising an outer package of cardboard or any other fairly stiff material and an inner package of a thin sealing material which completely covers the interior of the outer package, and a sealing lid which sealingly receives the upper edge both of the outer package and the inner package in a downwards open groove thereof, both said outer package and said inner package being formed of continuous blanks each including a bottom, side pieces and corner pieces, said corner pieces being comprised of a corner panel and a fold part on each side of said corner panel and resting against the inside of the adjacent side piece, the fold part of the outer package being received within the corresponding fold of the inner package and at least each fold part of the outer package being formed with somewhat less height than its side pieces and corresponding corner and side pieces of the inner package so that the upper part of the outer package along its whole upper edge will be formed by the inner package and only one layer of cardboard at the maximum.

2. A package according to claim 1, wherein the bottom section of the package is symmetrically polygonal with an even number of sides, and the side pieces of the package are interposed by the corner panels of the package.

3. A package according to claim 1, wherein the inner package extends to the same level as the upper edges of the sides of the outer package.

4. A package according to claim 1, wherein the corner fold lines of the inner package are so positioned aside of the corresponding corner fold lines of the outer package that the corresponding corners of the inner package and outer package the upper part of the package in a ready prepared package are located spaced from each other. 

1. A liquid and gas sealing package comprising an outer package of cardboard or any other fairly stiff material and an inner package of a thin sealing material which completely covers the interior of the outer package, and a sealing lid which sealingly receives the upper edge both of the outer package and the inner package in a downwards open groove thereof, both said outer package and said inner package being formed of continuous blanks each including a bottom, side pieces and corner pieces, said corner pieces being comprised of a corner panel and a fold part on each side of said corner panel and resting against the inside of the adjacent side piece, the fold part of the outer package being received within the corresponding fold of the inner package and at least each fold part of the outer package being formed with somewhat less height than its side pieces and corresponding corner and side pieces of the inner package so that the upper part of the outer package along its whole upper edge will be formed by the inner package and only one layer of cardboard at the maximum.
 2. A package according to claim 1, wherein the bottom section of the package is symmetrically polygonal with an even number of sides, and the side pieces of the package are interposed by the corner panels of the package.
 3. A package according to claim 1, wherein the inner package extends to the same level as the upper edges of the sides of the outer package.
 4. A package according to claim 1, wherein the corner fold lines of the inner package are so positioned aside of the corresponding corner fold lines of the outer package that the corresponding corners of the inner package and outer package the upper part of the package in a ready prepared package are located spaced from each other. 